The SHAtter exploit found by pod2g appears to have been leaked. Who leaked it and for what reason is still unclear. What is clear is that Apple will certainly find a way to patch the hardware if it did in fact leak. When Limera1n was released, it kept the SHAtter bootrom exploit safe for future jailbreaks as it would require a complete hardware revision to be done by Apple.
SHAtter basically used a hardware exploit in the A4 series of devices (iPhone 4, iPad, AppleTV 2nd generation, and iPod Touch 4G). You can bet Apple will make a hardware revision to patch SHAtter. It seems there is some drama between some members of the jailbreak community over who actually "leaked" the SHAtter exploit.
@P0isixninja of the Chronic Dev Team is pointing a blame finger to @Musclenerd. As Musclenerd concentrates on unlocks, it seems unreasonable to think he'd leak an exploit he would need in order to create an unlock. Click through for a response to the drama from @comex, who claims if it doesn't stop, he'll just e-mail the exploit directly to Apple. Not good news for the jailbreak community.